Generalized Frequency-Domain SAR Processing

E.C. Zaugg, D.G. Long
2009 IEEE Transactions on Geoscience and Remote Sensing  
The range-Doppler algorithm and the chirp-scaling algorithm (CSA) process synthetic aperture radar (SAR) data with approximations to ideal SAR processing. These approximations are invalid for data from systems with wide beamwidths, large bandwidths, and/or low center frequencies. While simple and efficient, these frequency-domain methods are thus limited by the SAR parameters. This paper explores these limits and proposes a generalized chirp-scaling approach for extending the utility of
more » ... utility of frequency-domain processing. We demonstrate how different order approximations of the SAR signal in the 2-D frequency domain affect image focusing for varying SAR parameters. From these results, a guideline is set forth, which suggests the required order of approximation terms for proper focusing. A proposed generalized frequency-domain processing approach is derived. This method is an efficient arbitrary-order CSA that processes the data using the appropriate number of approximation terms. The new method is demonstrated using simulated data. Index Terms-Data processing, frequency-domain analysis, synthetic aperture radar (SAR).
doi:10.1109/tgrs.2009.2025372 fatcat:abuzjrbl3jai3jgsicjbrferhi